Drilling tool



FIG. 1 is a perspective view of the drilling tool, showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown in the drawings represent disclaimed portions of the drilling tool that form no part of the claimed design. 

CLAIM The ornamental design for a drilling tool, as shown and described. 